90720769 has 2 divisors, whose sum is σ = 90720770. Its totient is φ = 90720768.

The previous prime is 90720767. The next prime is 90720793. The reversal of 90720769 is 96702709.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49914225 + 40806544 = 7065^2 + 6388^2 .

It is an emirp because it is prime and its reverse (96702709) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90720769 - 2¹ = 90720767 is a prime.

It is a super-2 number, since 2×90720769² = 16460515855902722, which contains 22 as substring.

Together with 90720767, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (90720761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45360384 + 45360385.

It is an arithmetic number, because the mean of its divisors is an integer number (45360385).

Almost surely, 2^90720769 is an apocalyptic number.

It is an amenable number.

90720769 is a deficient number, since it is larger than the sum of its proper divisors (1).

90720769 is an equidigital number, since it uses as much as digits as its factorization.

90720769 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 47628, while the sum is 40.

The square root of 90720769 is about 9524.7450884525. The cubic root of 90720769 is about 449.3336128377. Note that the first 3 decimals are identical.

The spelling of 90720769 in words is "ninety million, seven hundred twenty thousand, seven hundred sixty-nine".